Source : Webster's Revised Unabridged Dictionary (1913)

Vixen \Vix"en\, n. [AS. fixen a she-fox, for fyxen, fem. of fox.
   See {Fox}.]
   1. A female fox. [Obs. or Prov. Eng.]

   2. A cross, ill-tempered person; -- formerly used of either
      sex, now only of a woman. --Barrow.

            She was a vixen when she went to school. --Shak.

Source : WordNet®

vixen
     n : a malicious fierce-tempered woman [syn: {harpy}, {hellcat}]